DATASHEET 1 OUTPUT PCIE GEN1/2/3 SYNTHESIZER 5V41234 Typical Applications Features One output synthesizer for PCIe Gen1/2/3 3 x 3 mm 16-QFN package very small board footprint Spread-spectrum capable reduces EMI Description Outputs can be terminated to LVDS can drive a wider variety of devices The 5V41234 is a PCIe Gen2/3 compliant spread spectrum Spread enable via pin selection no software required to capable clock generator. The device has 1 differential configure device HCSL output and can be used in communication or embedded systems to substantially reduce Industrial temperature range available supports electro-magnetic interference (EMI). Spread spectrum can demanding embedded applications be enabled via a select pin. Key Specifications Output Features Cycle-to-cycle jitter < 100 ps 1 - 0.7V current mode differential HCSL output pairs PCIe Gen2 phase jitter < 3.0ps RMS PCIe Gen3 phase jitter < 1.0ps RMS Block Diagram VDD Control SS1 Logic CLK Phase Lock Loop CLK X1 Clock Buffer/ 25 MHz Crystal crystal /clock Oscillator X2 Crystal Tuning Capacitors R (IREF) R GND IDT 1 OUTPUT PCIE GEN1/2/3 SYNTHESIZER 1 5V41234 MAY 5, 20175V41234 1 OUTPUT PCIE GEN1/2/3 SYNTHESIZER Pin Assignment Spread Spectrum Select Table SS1 Spread% 0 -0.5% down 13 1 No spread GND 1 CLK X1 CLK X2 GND 9 VDDA NC 5 16-pin QFN Pin Descriptions Pin Pin Pin Type Pin Description Number Name 1 GND Power Connect to ground. 2 X1 XI Crystal or clock input. Connect to 25MHz crystal or single-ended clock. 3 X2 XO Crystal connection. Connect to parallel mode crystal. Leave floating if X1 is driven by single-ended clock. 4 NC No connect. 5 GND Power Connect to ground. 6 SS1 Input Spread Select 1. See table above. Internal pull-up resistor. 7 IREF Output 475 precision resistor must be attached to this pin, which is connected to internal current source. 8 NC No connect. 9 VDDA Power Connect to 3.3V and filter as analog supply. 10 GND Power Connect to ground. 11 CLK Output HCSL complementary output clock. 12 CLK Output HCSL true output clock. 13 NC No connect. 14 NC No connect. 15 VDD Power Connect to 3.3V for OSC and digital circuits. 16 NC No connect. IDT 1 OUTPUT PCIE GEN1/2/3 SYNTHESIZER 2 5V41234 MAY 5, 2017 GND NC SS1 VDD NC IREF NC NC